Aphyosemion filamentosum 3-4cm

The Aphyosemion filamentosum is a captivating and elegant species of killifish, known for its elongated fin filaments, iridescent body, and delicate red markings. Reaching 3–4cm as adults, this species stands out for its beauty and calm demeanor, making it a fantastic choice for species-only tanks, blackwater aquascapes, or biotope-inspired nano aquariums.

Native to Central Africa, particularly Cameroon, A. filamentosum thrives in shaded, slow-moving forest streams with soft, acidic water. Its stunning form and flowing fins are most striking in males, while females are more modestly colored. Though somewhat rare in the hobby, it is well-loved by killifish breeders and aquascaping enthusiasts alike for its graceful movement and ease of care in the right conditions.

🐠 Key Features:

• Scientific Name: Aphyosemion filamentosum

• Common Name: Filament Killifish

• Size: 3–4cm (adult)

• Lifespan: 2–3 years

• Temperament: Peaceful, slightly shy

• Difficulty Level: Moderate

• Origin: Cameroon, Central Africa

• Ideal in pairs or trios (1 male + 2 females) or small groups

🌊 Water Conditions

This species prefers soft, clean, and slightly acidic water with low to moderate lighting.

• Temperature: 20–24°C (68–75°F)

• pH: 5.5–6.8

• Hardness: 1–6 dGH

• Tank Size: 10–15 gallons or more

• Water Type: Freshwater

• Filtration: Gentle sponge filter or slow-flow system

• Lighting: Low to moderate; avoid bright, harsh lighting

Enhance comfort with floating plants, moss, driftwood, and leaf litter, creating a calm and natural environment.

🐟 Tank Mates

Aphyosemion filamentosum is best suited to species-only tanks or tanks with very calm, compatible fish.

Ideal tank mates:

• Pygmy Corydoras

• Otocinclus catfish

• Small rasboras (e.g., Chili, Strawberry)

• Peaceful dwarf shrimp (with caution)

• Snails (like Nerites)

Avoid:

• Large, aggressive, or fast-swimming species

• Fin-nippers

• Boisterous community setups

They display best and live longest in peaceful, well-maintained tanks with minimal stress.

🍽️ Feeding Habits

Like most killifish, A. filamentosum are micropredators and do best with small, live or frozen foods.

Recommended diet:

• Baby brine shrimp

• Microworms, daphnia, or vinegar eels

• Frozen cyclops or bloodworms

• High-quality soft micro pellets

• Finely crushed flake food as a supplement

Feed once or twice daily, focusing on small, easily digestible foods near the surface or mid-water.

🧼 Care and Maintenance

• Weekly water changes (15–25%)

• Maintain stable, clean water conditions

• Use a secure lid—killifish are known jumpers

• Keep tank lighting gentle to reduce stress

• Include spawning mops or moss if interested in breeding

With proper care, this species may breed in the home aquarium. Eggs are typically laid among plants or on spawning mops and can be collected for incubation.

🌿 Why Choose Aphyosemion filamentosum?

The Aphyosemion filamentosum offers a combination of beauty, tranquility, and elegance, ideal for aquarists looking to showcase a rare and graceful fish in a naturalistic setup. Its filamented fins and shimmering body make it a standout even in the most refined planted aquascapes.

Add a touch of flowing brilliance to your aquarium—discover Aphyosemion filamentosum today!